deleteCookie (name, optionsString) Arguments:
* name - the name of the cookie to be deleted
* optionsString - options for the cookie. Currently supported
"", "" '. optionsString "path =/path/, domain =.foo.com, recurse = true". . , , .
Delete a named cookie with specified path and domain. Be careful;
cookie, , . , cookie . , , . cookie, "recurse" , . ; . -O , O (n * m) , n - m - .